Conceptual Level or Detailed Code Level in OCPJWSD

Do you know if the OCPJWSD exam is at a more conceptual level?
I mean if know the concepts about EJB/SOAP/REST/WSDL/XML and how they work is enough - or is necessary to know those technologies at a detailed code level?

I don't know if I made myself clear If you don't understand what I mean, please let me know.